Replicative manufacturing of metal moulds for low surface roughness polymer replication

Area of Science:

• Materials Science
• Manufacturing Engineering
• Polymer Science

Background:

• Tool-based manufacturing, such as injection molding, is crucial for mass-producing optical polymer components.
• Current methods for creating these tools are expensive, labor-intensive, and time-consuming.
• Achieving high surface quality and microstructural fidelity in tools is essential for optical component precision.

Purpose of the Study:

• To develop a novel, cost-effective process for fabricating metal inserts for tool-based manufacturing.
• To utilize fused silica templates for creating high-quality replication molds.
• To demonstrate the scalability and efficiency of this new method compared to traditional techniques.

Main Methods:

• A casting and replication process using shaped fused silica templates was employed.
• Metal inserts were fabricated from bronze, brass, and cobalt-chromium.
• 3D-printing of fused silica casting molds was utilized for creating three-dimensional metal bodies.

Main Results:

• Successfully replicated metal inserts with smooth surfaces (Rq 8 nm) and microstructures (5 µm) from fused silica templates.
• Achieved high-quality injection molding with thousands of replicas from a single tool.
• Demonstrated the feasibility of creating complex 3D metal parts using 3D-printed fused silica molds.

Conclusions:

• The presented fused silica replication process offers a scalable, facile, and cost-effective route to high-quality molding tools.
• This approach surpasses the limitations of conventional machining techniques in terms of cost, labor, and equipment requirements.
• Enables efficient mass production of optical polymer components with precision-engineered metal tools.